unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Edit_1: TEdit;
    Combo_1: TComboBox;
    Edit_2: TEdit;
    procedure Edit_1Enter(Sender: TObject);
    procedure Combo_1Exit(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Edit_1Enter(Sender: TObject);
begin
  Combo_1.Left:=Edit_1.Left;
  Combo_1.Width:=Edit_1.Width;
  Combo_1.Height:=Edit_1.Height;
  Combo_1.Top:=Edit_1.Top;
  Combo_1.Visible:=True;
  Edit_1.SendToBack;
end;

procedure TForm1.Combo_1Exit(Sender: TObject);
begin
  Combo_1.SendToBack;
  //Combo_1.Visible:=False;
end;

end.
